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Filename : woocommerce.cls.php
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<?php
// phpcs:ignoreFile

/**
 * The Third Party integration with the WooCommerce plugin.
 *
 * @since         1.0.5
 * @since  1.6.6 Added function_exists check for compatibility
 * @package       LiteSpeed
 * @subpackage    LiteSpeed_Cache/thirdparty
 */

namespace LiteSpeed\Thirdparty;

defined('WPINC') || exit();

use LiteSpeed\API;
use LiteSpeed\Base;
use LiteSpeed\ESI;

class WooCommerce extends Base {

	const O_CACHE_TTL_FRONTPAGE = Base::O_CACHE_TTL_FRONTPAGE;

	const CACHETAG_SHOP     = 'WC_S';
	const CACHETAG_TERM     = 'WC_T.';
	const O_UPDATE_INTERVAL = 'wc_update_interval';
	const O_CART_VARY       = 'wc_cart_vary';
	const O_PQS_CS          = 0; // flush product on quantity + stock change, categories on stock change
	const O_PS_CS           = 1; // flush product and categories on stock change
	const O_PS_CN           = 2; // flush product on stock change, categories no flush
	const O_PQS_CQS         = 3; // flush product and categories on quantity + stock change

	const ESI_PARAM_ARGS    = 'wc_args';
	const ESI_PARAM_POSTID  = 'wc_post_id';
	const ESI_PARAM_NAME    = 'wc_name';
	const ESI_PARAM_PATH    = 'wc_path';
	const ESI_PARAM_LOCATED = 'wc_located';

	private $esi_enabled;

	/**
	 * Detects if WooCommerce is installed.
	 *
	 * @since 1.0.5
	 * @access public
	 */
	public static function detect() {
		if (!defined('WOOCOMMERCE_VERSION')) {
			return;
		}

		self::cls()->add_hooks();
	}

	/**
	 * Add hooks to woo actions
	 *
	 * @since  1.6.3
	 * @access public
	 */
	public function add_hooks() {
		$this->_option_append();

		$this->esi_enabled = apply_filters('litespeed_esi_status', false);

		add_action('litespeed_control_finalize', array( $this, 'set_control' ));
		add_action('litespeed_tag_finalize', array( $this, 'set_tag' ));

		// Purging a product on stock change should only occur during product purchase. This function will add the purging callback when an order is complete.
		add_action('woocommerce_product_set_stock', array( $this, 'purge_product' ));
		add_action('woocommerce_variation_set_stock', array( $this, 'purge_product' )); // #984479 Update variations stock

		add_action('comment_post', array( $this, 'add_review' ), 10, 3);

		if ($this->esi_enabled) {
			if (function_exists('is_shop') && !is_shop()) {
				add_action('litespeed_tpl_normal', array( $this, 'set_block_template' ));
				// No need for add-to-cart button
				// add_action( 'litespeed_esi_load-wc-add-to-cart-form', array( $this, 'load_add_to_cart_form_block' ) ) ;

				add_action('litespeed_esi_load-storefront-cart-header', array( $this, 'load_cart_header' ));
				add_action('litespeed_esi_load-widget', array( $this, 'register_post_view' ));
			}

			if (function_exists('is_product') && is_product()) {
				add_filter('litespeed_esi_params', array( $this, 'add_post_id' ), 10, 2);
			}

			// #612331 - remove WooCommerce geolocation redirect on ESI page (PR#708)
			if (!empty($_GET[ESI::QS_ACTION]) && !empty($_GET[ESI::QS_PARAMS])) {
				remove_action( 'template_redirect', array( 'WC_Cache_Helper', 'geolocation_ajax_redirect' ), 10 );
			}
		}

		if (is_admin()) {
			add_action('litespeed_api_purge_post', array( $this, 'backend_purge' )); // todo
			add_action('delete_term_relationships', array( $this, 'delete_rel' ), 10, 2);
			add_action('litespeed_settings_tab', array( $this, 'settings_add_tab' ));
			add_action('litespeed_settings_content', array( $this, 'settings_add_content' ));
			add_filter('litespeed_widget_default_options', array( $this, 'wc_widget_default' ), 10, 2);
		}

		if (apply_filters('litespeed_conf', self::O_CART_VARY)) {
			add_filter('litespeed_vary_cookies', function ( $list ) {
				$list[] = 'woocommerce_cart_hash';
				return array_unique($list);
			});
		}
	}

	/**
	 * Purge esi private tag
	 *
	 * @since  1.6.3
	 * @access public
	 */
	public function purge_esi() {
		do_action('litespeed_debug', '3rd woo purge ESI in action: ' . current_filter());
		do_action('litespeed_purge_private_esi', 'storefront-cart-header');
	}

	/**
	 * Purge private all
	 *
	 * @since  3.0
	 * @access public
	 */
	public function purge_private_all() {
		do_action('litespeed_purge_private_all');
	}

	/**
	 * Check if need to give an ESI block for cart
	 *
	 * @since  1.7.2
	 * @access public
	 */
	public function check_if_need_esi( $template ) {
		if ($this->vary_needed()) {
			do_action('litespeed_debug', 'API: 3rd woo added ESI');
			add_action('litespeed_tpl_normal', array( $this, 'set_swap_header_cart' ));
		}

		return $template;
	}

	/**
	 * Keep vary on if cart is not empty
	 *
	 * @since  1.7.2
	 * @access public
	 */
	public function vary_maintain( $vary ) {
		if ($this->vary_needed()) {
			do_action('litespeed_debug', 'API: 3rd woo added vary due to cart not empty');
			$vary['woo_cart'] = 1;
		}

		return $vary;
	}

	/**
	 * Check if vary need to be on based on cart
	 *
	 * @since  1.7.2
	 * @access private
	 */
	private function vary_needed() {
		if (!function_exists('WC')) {
			return false;
		}

		$woocom = WC();
		if (!$woocom) {
			return false;
		}

		if (is_null($woocom->cart)) {
			return false;
		}
		return $woocom->cart->get_cart_contents_count() > 0;
	}

	/**
	 * Hooked to the litespeed_is_not_esi_template action.
	 * If the request is not an esi request, I want to set my own hook in woocommerce_before_template_part to see if it's something I can ESI.
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public function set_block_template() {
		add_action('woocommerce_before_template_part', array( $this, 'block_template' ), 999, 4);
	}

	/**
	 * Hooked to the litespeed_is_not_esi_template action.
	 * If the request is not an esi request, I want to set my own hook
	 * in storefront_header to see if it's something I can ESI.
	 *
	 * Will remove storefront_header_cart in storefront_header.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 */
	public function set_swap_header_cart() {
		$priority = has_action('storefront_header', 'storefront_header_cart');
		if ($priority !== false) {
			remove_action('storefront_header', 'storefront_header_cart', $priority);
			add_action('storefront_header', array( $this, 'esi_cart_header' ), $priority);
		}
	}

	/**
	 * Hooked to the woocommerce_before_template_part action.
	 * Checks if the template contains 'add-to-cart'. If so, and if I want to ESI the request, block it and build my esi code block.
	 *
	 * The function parameters will be passed to the esi request.
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public function block_template( $template_name, $template_path, $located, $args ) {
		if (strpos($template_name, 'add-to-cart') === false) {
			if (strpos($template_name, 'related.php') !== false) {
				remove_action('woocommerce_before_template_part', array( $this, 'block_template' ), 999);
				add_filter('woocommerce_related_products_args', array( $this, 'add_related_tags' ));
				add_action('woocommerce_after_template_part', array( $this, 'end_template' ), 999);
			}
			return;
		}
		return;

		// todo: wny not use?

		global $post;
		$params = array(
			self::ESI_PARAM_ARGS => $args,
			self::ESI_PARAM_NAME => $template_name,
			self::ESI_PARAM_POSTID => $post->ID,
			self::ESI_PARAM_PATH => $template_path,
			self::ESI_PARAM_LOCATED => $located,
		);
		add_action('woocommerce_after_add_to_cart_form', array( $this, 'end_form' ));
		add_action('woocommerce_after_template_part', array( $this, 'end_form' ), 999);
		echo apply_filters('litespeed_esi_url', 'wc-add-to-cart-form', 'WC_CART_FORM', $params);
		echo apply_filters('litespeed_clean_wrapper_begin', '');
	}

	/**
	 * Hooked to the woocommerce_after_add_to_cart_form action.
	 * If this is hit first, clean the buffer and remove this function and
	 * end_template.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 */
	public function end_form( $template_name = '' ) {
		if (!empty($template_name) && strpos($template_name, 'add-to-cart') === false) {
			return;
		}
		echo apply_filters('litespeed_clean_wrapper_end', '');
		remove_action('woocommerce_after_add_to_cart_form', array( $this, 'end_form' ));
		remove_action('woocommerce_after_template_part', array( $this, 'end_form' ), 999);
	}

	/**
	 * If related products are loaded, need to add the extra product ids.
	 *
	 * The page will be purged if any of the products are changed.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param array $args The arguments used to build the related products section.
	 * @return array The unchanged arguments.
	 */
	public function add_related_tags( $args ) {
		if (empty($args) || !isset($args['post__in'])) {
			return $args;
		}
		$related_posts = $args['post__in'];
		foreach ($related_posts as $related) {
			do_action('litespeed_tag_add_post', $related);
		}
		return $args;
	}

	/**
	 * Hooked to the woocommerce_after_template_part action.
	 * If the template contains 'add-to-cart', clean the buffer.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param type $template_name
	 */
	public function end_template( $template_name ) {
		if (strpos($template_name, 'related.php') !== false) {
			remove_action('woocommerce_after_template_part', array( $this, 'end_template' ), 999);
			$this->set_block_template();
		}
	}

	/**
	 * Hooked to the storefront_header header.
	 * If I want to ESI the request, block it and build my esi code block.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 */
	public function esi_cart_header() {
		echo apply_filters('litespeed_esi_url', 'storefront-cart-header', 'STOREFRONT_CART_HEADER');
	}

	/**
	 * Hooked to the litespeed_esi_load-storefront-cart-header action.
	 * Generates the cart header for esi display.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 */
	public function load_cart_header() {
		storefront_header_cart();
	}

	/**
	 * Hooked to the litespeed_esi_load-wc-add-to-cart-form action.
	 * Parses the esi input parameters and generates the add to cart form
	 * for esi display.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 * @global type $post
	 * @global type $wp_query
	 * @param type $params
	 */
	public function load_add_to_cart_form_block( $params ) {
		global $post, $wp_query;
		$post = get_post($params[self::ESI_PARAM_POSTID]);
		$wp_query->setup_postdata($post);
		function_exists('wc_get_template') && wc_get_template($params[self::ESI_PARAM_NAME], $params[self::ESI_PARAM_ARGS], $params[self::ESI_PARAM_PATH]);
	}

	/**
	 * Update woocommerce when someone visits a product and has the
	 * recently viewed products widget.
	 *
	 * Currently, this widget should not be cached.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param array $params Widget parameter array
	 */
	public function register_post_view( $params ) {
		if ($params[API::PARAM_NAME] !== 'WC_Widget_Recently_Viewed') {
			return;
		}
		if (!isset($params[self::ESI_PARAM_POSTID])) {
			return;
		}
		$id       = $params[self::ESI_PARAM_POSTID];
		$esi_post = get_post($id);
		$product  = function_exists('wc_get_product') ? wc_get_product($esi_post) : false;

		if (empty($product)) {
			return;
		}

		global $post;
		$post = $esi_post;
		function_exists('wc_track_product_view') && wc_track_product_view();
	}

	/**
	 * Adds the post id to the widget ESI parameters for the Recently Viewed widget.
	 *
	 * This is needed in the ESI request to update the cookie properly.
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public function add_post_id( $params, $block_id ) {
		if ($block_id == 'widget') {
			if ($params[API::PARAM_NAME] == 'WC_Widget_Recently_Viewed') {
				$params[self::ESI_PARAM_POSTID] = get_the_ID();
			}
		}

		return $params;
	}

	/**
	 * Hooked to the litespeed_widget_default_options filter.
	 *
	 * The recently viewed widget must be esi to function properly.
	 * This function will set it to enable and no cache by default.
	 *
	 * @since 1.1.0
	 * @access public
	 */
	public function wc_widget_default( $options, $widget ) {
		if (!is_array($options)) {
			return $options;
		}
		$widget_name = get_class($widget);
		if ($widget_name === 'WC_Widget_Recently_Viewed') {
			$options[API::WIDGET_O_ESIENABLE] = API::VAL_ON2;
			$options[API::WIDGET_O_TTL]       = 0;
		} elseif ($widget_name === 'WC_Widget_Recent_Reviews') {
			$options[API::WIDGET_O_ESIENABLE] = API::VAL_ON;
			$options[API::WIDGET_O_TTL]       = 86400;
		}
		return $options;
	}

	/**
	 * Set WooCommerce cache tags based on page type.
	 *
	 * @since 1.0.9
	 * @since 1.6.3 Removed static
	 * @access public
	 */
	public function set_tag() {
		$id = get_the_ID();
		if ($id === false) {
			return;
		}

		// Check if product has a cache ttl limit or not
		$sale_from = (int) get_post_meta($id, '_sale_price_dates_from', true);
		$sale_to   = (int) get_post_meta($id, '_sale_price_dates_to', true);
		$now       = current_time('timestamp');
		$ttl       = false;
		if ($sale_from && $now < $sale_from) {
			$ttl = $sale_from - $now;
		} elseif ($sale_to && $now < $sale_to) {
			$ttl = $sale_to - $now;
		}
		if ($ttl && $ttl < apply_filters('litespeed_control_ttl', 0)) {
			do_action('litespeed_control_set_ttl', $ttl, "WooCommerce set scheduled TTL to $ttl");
		}

		if (function_exists('is_shop') && is_shop()) {
			do_action('litespeed_tag_add', self::CACHETAG_SHOP);
		}
		if (function_exists('is_product_taxonomy') && !is_product_taxonomy()) {
			return;
		}
		if (isset($GLOBALS['product_cat']) && is_string($GLOBALS['product_cat'])) {
			// todo: need to check previous woo version to find if its from old woo versions or not!
			$term = get_term_by('slug', $GLOBALS['product_cat'], 'product_cat');
		} elseif (isset($GLOBALS['product_tag']) && is_string($GLOBALS['product_tag'])) {
			$term = get_term_by('slug', $GLOBALS['product_tag'], 'product_tag');
		} else {
			$term = false;
		}

		if ($term === false) {
			return;
		}
		while (isset($term)) {
			do_action('litespeed_tag_add', self::CACHETAG_TERM . $term->term_id);
			if ($term->parent == 0) {
				break;
			}
			$term = get_term($term->parent);
		}
	}

	/**
	 * Check if the page is cacheable according to WooCommerce.
	 *
	 * @since 1.0.5
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param string $esi_id        The ESI block id if a request is an ESI request.
	 * @return boolean              True if cacheable, false if not.
	 */
	public function set_control( $esi_id ) {
		if (!apply_filters('litespeed_control_cacheable', false)) {
			return;
		}

		/**
		 * Avoid possible 500 issue
		 *
		 * @since 1.6.2.1
		 */
		if (!function_exists('WC')) {
			return;
		}

		$woocom = WC();
		if (!$woocom || empty($woocom->session)) {
			return;
		}

		// For later versions, DONOTCACHEPAGE should be set.
		// No need to check uri/qs.
		if (version_compare($woocom->version, '1.4.2', '>=')) {
			if (version_compare($woocom->version, '3.2.0', '<') && defined('DONOTCACHEPAGE') && DONOTCACHEPAGE) {
				do_action('litespeed_control_set_nocache', '3rd party woocommerce not cache by constant');
				return;
			} elseif (version_compare($woocom->version, '2.1.0', '>=')) {
				$err = false;

				if (!function_exists('wc_get_page_id')) {
					return;
				}
				/**
				 * From woo/inc/class-wc-cache-helper.php:prevent_caching()
				 *
				 * @since  1.4
				 */
				$page_ids = array_filter(array( wc_get_page_id('cart'), wc_get_page_id('checkout'), wc_get_page_id('myaccount') ));
				if (isset($_GET['download_file']) || isset($_GET['add-to-cart']) || is_page($page_ids)) {
					$err = 'woo non cacheable pages';
				} elseif (function_exists('wc_notice_count') && wc_notice_count() > 0) {
					$err = 'has wc notice';
				}

				if ($err) {
					do_action('litespeed_control_set_nocache', '3rd party woocommerce not cache due to ' . $err);
					return;
				}
			}
			return;
		}

		$uri     = esc_url($_SERVER['REQUEST_URI']);
		$uri_len = strlen($uri);
		if ($uri_len < 5) {
			return;
		}

		if (in_array($uri, array( 'cart/', 'checkout/', 'my-account/', 'addons/', 'logout/', 'lost-password/', 'product/' ))) {
			// why contains `product`?
			do_action('litespeed_control_set_nocache', 'uri in cart/account/user pages');
			return;
		}

		$qs     = sanitize_text_field($_SERVER['QUERY_STRING']);
		$qs_len = strlen($qs);
		if (!empty($qs) && $qs_len >= 12 && strpos($qs, 'add-to-cart=') === 0) {
			do_action('litespeed_control_set_nocache', 'qs contains add-to-cart');
			return;
		}
	}

	/**
	 * Purge a product page and related pages (based on settings) on checkout.
	 *
	 * @since 1.0.9
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param WC_Product $product
	 */
	public function purge_product( $product ) {
		do_action('litespeed_debug', '[3rd] Woo Purge [pid] ' . $product->get_id());

		$do_purge = function ( $action, $debug = '' ) use ( $product ) {
			$config = apply_filters('litespeed_conf', self::O_UPDATE_INTERVAL);
			if (is_null($config)) {
				$config = self::O_PQS_CS;
			}

			if ($config === self::O_PQS_CQS) {
				$action();
				if ($debug) {
					do_action('litespeed_debug', $debug);
				}
			} elseif ($config !== self::O_PQS_CS && $product->is_in_stock()) {
				do_action('litespeed_debug', '[3rd] Woo No purge needed [option] ' . $config);
				return false;
			} elseif ($config !== self::O_PS_CN && !$product->is_in_stock()) {
				$action();
				if ($debug) {
					do_action('litespeed_debug', $debug);
				}
			}
			return true;
		};

		if (
			!$do_purge(function () use ( $product ) {
				$this->backend_purge($product->get_id());
			})
		) {
			return;
		}

		do_action('litespeed_purge_post', $product->get_id());

		// Check if is variation, purge stock too #984479
		if ($product->is_type('variation')) {
			do_action('litespeed_purge_post', $product->get_parent_id());
		}

		// Check if WPML is enabled ##972971
		if (defined('WPML_PLUGIN_BASENAME')) {
			// Check if it is a variable product and get post/parent ID
			$wpml_purge_id = $product->is_type('variation') ? $product->get_parent_id() : $product->get_id();
			$type          = apply_filters('wpml_element_type', get_post_type($wpml_purge_id));
			$trid          = apply_filters('wpml_element_trid', false, $wpml_purge_id, $type);
			$translations  = apply_filters('wpml_get_element_translations', array(), $trid, $type);
			foreach ($translations as $lang => $translation) {
				do_action('litespeed_debug', '[3rd] Woo WPML purge language: ' . $translation->language_code . ' , post ID: ' . $translation->element_id);
				do_action('litespeed_purge_post', $translation->element_id);
				// use the $translation->element_id as it is post ID of other languages
			}

			// Check other languages category and purge if configured.
			// wp_get_post_terms() only returns default language category ID
			$default_cats = wp_get_post_terms($wpml_purge_id, 'product_cat');
			$languages    = apply_filters('wpml_active_languages', null);

			foreach ($default_cats as $default_cat) {
				foreach ($languages as $language) {
					$tr_cat_id = icl_object_id($default_cat->term_id, 'product_cat', false, $language['code']);
					$do_purge(function () use ( $tr_cat_id ) {
						do_action('litespeed_purge', self::CACHETAG_TERM . $tr_cat_id);
					}, '[3rd] Woo Purge WPML category [language] ' . $language['code'] . ' [cat] ' . $tr_cat_id);
				}
			}
		}
	}

	/**
	 * Delete object-term relationship. If the post is a product and
	 * the term ids array is not empty, will add purge tags to the deleted
	 * terms.
	 *
	 * @since 1.0.9
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param int   $post_id Object ID.
	 * @param array $term_ids An array of term taxonomy IDs.
	 */
	public function delete_rel( $post_id, $term_ids ) {
		if (!function_exists('wc_get_product')) {
			return;
		}

		if (empty($term_ids) || wc_get_product($post_id) === false) {
			return;
		}
		foreach ($term_ids as $term_id) {
			do_action('litespeed_purge', self::CACHETAG_TERM . $term_id);
		}
	}

	/**
	 * Purge a product's categories and tags pages in case they are affected.
	 *
	 * @since 1.0.9
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param int $post_id Post id that is about to be purged
	 */
	public function backend_purge( $post_id ) {
		if (!function_exists('wc_get_product')) {
			return;
		}

		if (!isset($post_id) || wc_get_product($post_id) === false) {
			return;
		}

		$cats = $this->get_cats($post_id);
		if (!empty($cats)) {
			foreach ($cats as $cat) {
				do_action('litespeed_purge', self::CACHETAG_TERM . $cat);
			}
		}

		if (!function_exists('wc_get_product_terms')) {
			return;
		}

		$tags = wc_get_product_terms($post_id, 'product_tag', array( 'fields' => 'ids' ));
		if (!empty($tags)) {
			foreach ($tags as $tag) {
				do_action('litespeed_purge', self::CACHETAG_TERM . $tag);
			}
		}
	}

	/**
	 * When a product has a new review added, purge the recent reviews widget.
	 *
	 * @since 1.1.0
	 * @since 1.6.3 Removed static
	 * @access public
	 * @param $unused
	 * @param integer $comment_approved Whether the comment is approved or not.
	 * @param array   $commentdata Information about the comment.
	 */
	public function add_review( $unused, $comment_approved, $commentdata ) {
		if (!function_exists('wc_get_product')) {
			return;
		}

		$post_id = $commentdata['comment_post_ID'];
		if ($comment_approved !== 1 || !isset($post_id) || wc_get_product($post_id) === false) {
			return;
		}

		global $wp_widget_factory;
		if (!isset($wp_widget_factory->widgets['WC_Widget_Recent_Reviews'])) {
			return;
		}

		$recent_reviews = $wp_widget_factory->widgets['WC_Widget_Recent_Reviews'];
		if (!is_null($recent_reviews)) {
			do_action('litespeed_tag_add_widget', $recent_reviews->id);
		}
	}

	/**
	 * Append new options
	 *
	 * @since 1.6.3 Removed static
	 * @since  3.0 new API
	 */
	private function _option_append() {
		// Append option save value filter
		do_action('litespeed_conf_multi_switch', self::O_UPDATE_INTERVAL, 3); // This need to be before conf_append

		do_action('litespeed_conf_append', self::O_UPDATE_INTERVAL, false);
		do_action('litespeed_conf_append', self::O_CART_VARY, false);
	}

	/**
	 * Hooked to `litespeed_settings_tab` action.
	 * Adds the integration configuration options (currently, to determine purge rules)
	 *
	 * @since 1.6.3 Removed static
	 */
	public function settings_add_tab( $setting_page ) {
		if ($setting_page != 'cache') {
			return;
		}

		require 'woocommerce.tab.tpl.php';
	}

	/**
	 * Hook to show config content
	 *
	 * @since  3.0
	 */
	public function settings_add_content( $setting_page ) {
		if ($setting_page != 'cache') {
			return;
		}

		require 'woocommerce.content.tpl.php';
	}

	/**
	 * Helper function to select the function(s) to use to get the product
	 * category ids.
	 *
	 * @since 1.0.10
	 * @since 1.6.3 Removed static
	 * @access private
	 * @param int $product_id The product id
	 * @return array An array of category ids.
	 */
	private function get_cats( $product_id ) {
		if (!function_exists('WC')) {
			return;
		}

		$woocom = WC();
		if (isset($woocom) && version_compare($woocom->version, '2.5.0', '>=') && function_exists('wc_get_product_cat_ids')) {
			return wc_get_product_cat_ids($product_id);
		}
		$product_cats = wp_get_post_terms($product_id, 'product_cat', array( 'fields' => 'ids' ));
		foreach ($product_cats as $product_cat) {
			$product_cats = array_merge($product_cats, get_ancestors($product_cat, 'product_cat'));
		}

		return $product_cats;
	}

	/**
	 * 3rd party prepload
	 *
	 * @since  2.9.8.4
	 */
	public static function preload() {
		/**
		 * Auto puge for WooCommerce Advanced Bulk Edit plugin,
		 * Bulk edit hook need to add to preload as it will die before detect.
		 */
		add_action('wp_ajax_wpmelon_adv_bulk_edit', __CLASS__ . '::bulk_edit_purge', 1);
	}

	/**
	 * Auto puge for WooCommerce Advanced Bulk Edit plugin,
	 *
	 * @since  2.9.8.4
	 */
	public static function bulk_edit_purge() {
		if (empty($_POST['type']) || $_POST['type'] != 'saveproducts' || empty($_POST['data'])) {
			return;
		}

		/*
		 * admin-ajax form-data structure
		 * array(
		 *      "type" => "saveproducts",
		 *      "data" => array(
		 *          "column1" => "464$###0$###2#^#463$###0$###4#^#462$###0$###6#^#",
		 *          "column2" => "464$###0$###2#^#463$###0$###4#^#462$###0$###6#^#"
		 *      )
		 *  )
		 */
		$stock_string_arr = array();
		foreach ($_POST['data'] as $stock_value) {
			$stock_string_arr = array_merge($stock_string_arr, explode('#^#', $stock_value));
		}

		$lscwp_3rd_woocommerce = new self();

		if (count($stock_string_arr) < 1) {
			return;
		}

		foreach ($stock_string_arr as $edited_stock) {
			$product_id = strtok($edited_stock, '$');
			$product    = wc_get_product($product_id);

			if (empty($product)) {
				do_action('litespeed_debug', '3rd woo purge: ' . $product_id . ' not found.');
				continue;
			}

			$lscwp_3rd_woocommerce->purge_product($product);
		}
	}
}